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Figure 6: (a-c) Eleven year old boy [case 5-Table 1] with daily seizures. MRI brain (1.5 T) showing right posterior quadrant dysplasia (arrows) with suspicious white matter abnormality over the left frontal regions (arrow head). PET scan shows right hemispheric hypometabolism that is maximal over the right posterior head region (arrows), but normal on the left hemisphere (d, e and f). Interictal EEG (g) shows right posterior head region slowing as theta-delta activity (*), right posterior-temporaloccipital (PHR) (arrow), right frontal-temporal (short arrow) and less frequent left frontal epileptiform abnormalities. (f) VEEG recorded seizures from the right posterior head regions, as sequential right posterior temporal-occipital spikes (arrows) that evolves lateral over the right hemisphere (with prominent nystagmoid artifacts during evolution i-red arrows) to end over the right hemisphere (j-arrows) followed by postictal attenuation over the right hemisphere (k-*). DTI demonstrated abnormalities over right PHR only (l). Patient underwent right posterior quadrant disconnection to be seizure free (10 months). PHR = Posterior head region, DTI = Diffusion tensor imaging

Figure 6: (a-c) Eleven year old boy [case 5-Table 1] with daily seizures. MRI brain (1.5 T) showing right posterior quadrant
dysplasia (arrows) with suspicious white matter abnormality over the left frontal regions (arrow head). PET scan shows right hemispheric hypometabolism that is maximal over the right posterior head region (arrows), but normal on the left hemisphere (d, e and f). Interictal EEG (g) shows right posterior head region slowing as theta-delta activity (*), right posterior-temporaloccipital (PHR) (arrow), right frontal-temporal (short arrow) and less frequent left frontal epileptiform abnormalities. (f) VEEG recorded seizures from the right posterior head regions, as sequential right posterior temporal-occipital spikes (arrows) that evolves lateral over the right hemisphere (with prominent nystagmoid artifacts during evolution i-red arrows) to end over the right hemisphere (j-arrows) followed by postictal attenuation over the right hemisphere (k-*). DTI demonstrated abnormalities over right PHR only (l). Patient underwent right posterior quadrant disconnection to be seizure free (10 months). PHR = Posterior head region, DTI = Diffusion tensor imaging